请求/响应记录的响应主体 [英] Response body for request/response Logging

问题描述

我正在尝试编写一个Owin中间件组件，该组件将记录每个传入的请求和对数据库的响应.

I'm trying to write a Owin midleware component that would LOG every incoming request and response to the database.

这是我设法达到的目标.

Here's how far I managed to get.

我在阅读response.body时被卡住了.说:

I got stuck on reading the response.body. Says:

流不支持阅读.

Stream does not support reading.

我如何阅读Response.Body?

How can I read the Response.Body ?

 public class LoggingMiddleware : OwinMiddleware
 {
        private static Logger log = LogManager.GetLogger("WebApi");

        public LoggingMiddleware(OwinMiddleware next, IAppBuilder app)
            : base(next)
        {
        }

    public override async Task Invoke(IOwinContext context)
    {
        using (var db = new HermesEntities())
        {

            var sw = new Stopwatch();
            sw.Start();

            var logRequest = new log_Request
            {
                Body = new StreamReader(context.Request.Body).ReadToEndAsync().Result,
                Headers = Json.Encode(context.Request.Headers),
                IPTo = context.Request.LocalIpAddress,
                IpFrom = context.Request.RemoteIpAddress,
                Method = context.Request.Method,
                Service = "Api",
                Uri = context.Request.Uri.ToString(),
                UserName = context.Request.User.Identity.Name

            };
            db.log_Request.Add(logRequest);
            context.Request.Body.Position = 0;

            await Next.Invoke(context);

            var mem2 = new MemoryStream();
            await context.Response.Body.CopyToAsync(mem2);

            var logResponse = new log_Response
            {
                Headers = Json.Encode(context.Response.Headers),
                Body = new StreamReader(mem2).ReadToEndAsync().Result,
                ProcessingTime = sw.Elapsed,
                ResultCode = context.Response.StatusCode,
                log_Request = logRequest
            };

            db.log_Response.Add(logResponse);

            await db.SaveChangesAsync();
        }
    }
}

推荐答案

可以通过以下方式记录响应正文:

Response Body can be logged in this manner:

public class LoggingMiddleware : OwinMiddleware
{
    private static Logger log = LogManager.GetLogger("WebApi");

    public LoggingMiddleware(OwinMiddleware next, IAppBuilder app)
        : base(next)
    {
    }

    public override async Task Invoke(IOwinContext context)
    {
        using (var db = new HermesEntities())
        {

           var sw = new Stopwatch();
           sw.Start();

           var logRequest = new log_Request
           {
               Body = new StreamReader(context.Request.Body).ReadToEndAsync().Result,
               Headers = Json.Encode(context.Request.Headers),
               IPTo = context.Request.LocalIpAddress,
               IpFrom = context.Request.RemoteIpAddress,
               Method = context.Request.Method,
               Service = "Api",
               Uri = context.Request.Uri.ToString(),
               UserName = context.Request.User.Identity.Name
           };

           db.log_Request.Add(logRequest);
           context.Request.Body.Position = 0;

           Stream stream = context.Response.Body;
           MemoryStream responseBuffer = new MemoryStream();
           context.Response.Body = responseBuffer;

           await Next.Invoke(context);

           responseBuffer.Seek(0, SeekOrigin.Begin);
           var responseBody = new StreamReader(responseBuffer).ReadToEnd();

           //do logging

           var logResponse = new log_Response
           {
               Headers = Json.Encode(context.Response.Headers),
               Body = responseBody,
               ProcessingTime = sw.Elapsed,
               ResultCode = context.Response.StatusCode,
               log_Request = logRequest
           };

           db.log_Response.Add(logResponse);

           responseBuffer.Seek(0, SeekOrigin.Begin);
           await responseBuffer.CopyToAsync(stream);

           await db.SaveChangesAsync();
        }
    }
}

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